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  <title>转换十六进制字符串为二进制字符串</title>
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  <div id="layout-content"><div id="function.hex2bin" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">hex2bin</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.4.0, PHP 7)</p><p class="refpurpose"><span class="refname">hex2bin</span> &mdash; <span class="dc-title">转换十六进制字符串为二进制字符串</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.hex2bin-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>hex2bin</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   转换十六进制字符串为二进制字符串。
  </p>
  <div class="caution"><strong class="caution">Caution</strong>
   <p class="para">
    这个函数<em class="emphasis">不是</em> 转换十六进制数字为二进制数字。这种转换可以使用<span class="function"><a href="base_convert.html" class="function">base_convert()</a></span> 函数。
   </p>
  </div>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.hex2bin-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">data</code></dt>

    <dd>

     <p class="para">
      十六进制表示的数据
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.hex2bin-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回给定数据的二进制表示  或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-function.hex2bin-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   如果输入的十六进制字符串是奇数长数或者无效的十六进制字符串将会抛出
   <strong><code>E_WARNING</code></strong> 级别的错误。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.hex2bin-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.5.1</td>
       <td>
        如果输入的字符串是无效的十六进制字符串则抛出一个警告，
       </td>
      </tr>

      <tr>
       <td>5.4.4</td>
       <td>
        如果输入的字符串有多余将抛出异常。 PHP 5.4.0 起字符串将被静默地接受，但是最后的字节会被截断。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.hex2bin-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-5909">
   <p><strong>Example #1 <span class="function"><strong>hex2bin()</strong></span> 例子</strong></p>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$hex&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">hex2bin</span><span style="color: #007700">(</span><span style="color: #DD0000">"6578616d706c65206865782064617461"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$hex</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
string(16) &quot;example hex data&quot;
</pre></div>
   </div>
  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.hex2bin-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="bin2hex.html" class="function" rel="rdfs-seeAlso">bin2hex()</a> - 函数把包含数据的二进制字符串转换为十六进制值</span></li>
    <li class="member"><span class="function"><a href="unpack.html" class="function" rel="rdfs-seeAlso">unpack()</a> - Unpack data from binary string</span></li>
   </ul>
  </p>
 </div>


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